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A Tsunami Deposit at the Cretaceous-Tertiary Boundary in Texas.
- Source :
-
Science . 7/29/1988, Vol. 241 Issue 4865, p567-570. 4p. - Publication Year :
- 1988
-
Abstract
- At sites near the Brazos River, Texas, an iridium anomaly and the paleontologic Cretaceous-Tertiary boundary directly overlie a sandstone bed in which coarse-grained sandstone with large clasts of mudstone and reworked carbonate nodules grades upward to wave ripple-laminated, very fine grained sandstone. This bed is the only sandstone bed in a sequence of uppermost Cretaceous to lowermost Paleocene mudstone that records about 1 million years of quiet water deposition in midshelf to outer shelf depths. Conditions for depositing such a sandstone layer at these depths are most consistent with the occurrence of a tsunami about 50 to 100 meters high. The most likely source for such a tsunami at the Cretaceous-Tertiary boundary is a bolidewater impact. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00368075
- Volume :
- 241
- Issue :
- 4865
- Database :
- Academic Search Index
- Journal :
- Science
- Publication Type :
- Academic Journal
- Accession number :
- 87460491
- Full Text :
- https://doi.org/10.1126/science.241.4865.567